Pump Horsepower vs Speed and Diameter (\( \frac{Hp1}{Hp2} = \left(\frac{N1^3}{N2^3}\right) \left(\frac{D1^5}{D2^5}\right) \)):

Where:

• \( Hp1 \) is the initial pump power, in horsepower (hp).
• \( Hp2 \) is the final pump power, in horsepower (hp).
• \( N1 \) is the initial pump speed, in rpm.
• \( N2 \) is the final pump speed, in rpm.
• \( D1 \) is the initial pump diameter, in inches.
• \( D2 \) is the final pump diameter, in inches.